CN214635361U

CN214635361U - Tail gas quenching-spraying integrated tower device for mining reduction furnace

Info

Publication number: CN214635361U
Application number: CN202120783000.9U
Authority: CN
Inventors: 张强; 费宇斌; 施继超; 杨宁; 李倩倩
Original assignee: Shanghai Xianyun Environmental Protection Technology Co ltd
Current assignee: Shanghai Xianyun Environmental Protection Technology Co ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-11-09
Anticipated expiration: 2031-04-16

Abstract

The utility model relates to a tail gas quenching-spraying integrated tower device of a mining reduction furnace, which replaces the function of a desulfurizing tower in the field, and the bottom of a quencher is communicated with the side wall of a spraying tower through an elbow; the connecting position of the rear flue of the elbow and the spray tower has a downward inclined angle of 7-9 degrees relative to the horizontal plane; the upper port of the quencher is a flue gas inlet, the side wall of the quencher is communicated with at least one spray gun, and the side wall of the spray gun is communicated with a compressed gas source; a branch pipeline extends from the spraying circulation pipeline of the spraying tower to the spray gun. The area occupied by the desulfurizing tower in the utility model is only the spray tower, which can effectively reduce the area occupied by the desulfurizing tower; the waste liquid that produces in the quench cooler adopts the spray column, and cyclic utilization cools down, has practiced thrift the energy and has reduced the production of waste water. The design of the included angle between the quencher and the spray tower ensures that the flue gas firstly moves downwards and then upwards, thus indirectly increasing the redistribution distance of the flue gas from the quencher to the spray tower and fully and uniformly distributing the flue gas in the spray tower.

Description

Tail gas quenching-spraying integrated tower device for mining reduction furnace

Technical Field

The utility model relates to a mining industry reduction furnace tail gas rapid cooling-spraying integrated tower device belongs to mining industry stove tail gas treatment technical field.

Background

Mine kiln tail gas, generally high concentration SO₂The tail gas of the mining furnace is 500 ℃ and contains SO₂＜10000mg/Nm³Dust < 1000mg/Nm³. The cooling mode of the high-temperature flue gas comprises direct cooling and indirect cooling, and the cooling pipe is easy to block by adopting indirect cooling due to higher dust content of the tail gas of the mining furnace, so that the operation and the maintenance are difficult. The direct cooling, namely the evaporative cooling, has the advantages of high heat exchange efficiency and high cooling speed, and plays a role in coarse dust removal while cooling. The quencher is directly cooled, the flue gas after quenching enters a spray tower to react with the circularly sprayed hydrogen peroxide to remove SO₂Can realize SO in the tail gas₂(＜35mg/Nm³) And (4) ultralow emission.

The existing quencher falls on the ground, so that the occupied area of the desulfurizing tower is large; in addition, the water inlet of the quencher is generally directly connected with a process water source, so that the water consumption is large and the amount of generated waste water is also large.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tail gas quenching-spraying integrated tower device of a mining reduction furnace, which can effectively reduce the occupied area of a desulfurizing tower; meanwhile, the waste liquid generated in the spray tower is adopted by the quencher, so that the waste liquid is recycled for cooling, the energy is saved, and the generation of waste water is reduced.

The utility model adopts the following technical proposal:

a tail gas quenching-spraying integrated tower device of a mining reduction furnace comprises a quencher 1 and a spray tower; the bottom of the quencher 1 is communicated with the side wall of the spray tower through an elbow 3; the connecting position of the elbow 3 rear flue and the spray tower has a downward inclined inclination angle of 7-9 degrees relative to the horizontal plane; the upper port of the quencher 1 is a flue gas inlet, the side wall of the quencher is communicated with at least one spray gun 2, and the side wall of the spray gun 2 is communicated with a compressed gas source; a branch pipeline 6 extends from the spraying circulation pipeline of the spraying tower to the spray gun 2.

Preferably, the branch pipeline 6 is externally connected with a process water source.

Preferably, the quencher 1 is cylindrical and is provided with three layers of spray guns 2.

Preferably, the quencher is made of carbon steel lined graphite.

Preferably, three layers of spray pipes 4 are arranged in the spray tower, and a plurality of nozzles are arranged on each layer of spray pipe 4; a demister 5 is arranged above the spray pipe 4 at the top layer.

Furthermore, the inner structure and the nozzle of the spray tower are made of carbon steel lining PTFE.

Preferably, the outlet flue gas pipeline of the quencher 1 is provided with a thermometer, and the flow of the process water and the circulating liquid injected into the quencher 1 is adjusted according to the temperature.

The beneficial effects of the utility model reside in that:

1) the cooling-spraying integrated tower device has the advantages that the occupied area of the desulfurizing tower only passes through the spraying tower, so that the occupied area of the desulfurizing tower can be effectively reduced;

2) the waste liquid that produces in the quench cooler adopts the spray column, and cyclic utilization cools down, and accessible external technology water source supplements when the water source is not enough, has practiced thrift the energy and has reduced the production of waste water.

3) The included angle between the quencher and the spray tower is designed to be a downward-inclined inclination angle of 7-9 degrees relative to the horizontal plane, so that the flue gas moves downwards at first and then upwards, the redistribution distance of the flue gas from the quencher to the spray tower is indirectly increased, the flue gas is fully and uniformly distributed in the spray tower, and meanwhile, the design of 7-9 degrees is obtained through engineering practice verification, so that the direct impact corrosion of the flue gas on the side wall of the spray tower is reduced, and the flowing efficiency of the flue gas is considered.

Drawings

FIG. 1 is a schematic diagram of the process of the tail gas quenching-spraying integrated tower device of the reduction furnace in mining industry.

Fig. 2 is a schematic structural diagram of the tail gas quenching-spraying integrated tower device of the mining reduction furnace of the utility model.

Fig. 3 is a sectional view taken along line a-a in fig. 2.

In the figure, 1, a quencher, 2, a spray gun, 3, an elbow, 4, a spray pipe, 5, a demister and 6, branch pipelines are arranged.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to FIGS. 1-2, this is a high concentration SO₂The sulfuric acid recovery device for the tail gas of the mining furnace can realize the high-efficiency recovery and utilization of SO2 in the tail gas and the SO in the tail gas₂Ultra-low emission. The device comprises: a quencher 1 with a cylindrical cavity body and a spray tower; the bottom of the quencher 1 is communicated with the side wall of the spray tower through an elbow 3; the connecting position of the elbow 3 rear flue and the spray tower has a downward inclined angle of 8 degrees relative to the horizontal plane; the upper port of the quencher 1 is a flue gas inlet, the side wall of the quencher is communicated with the three-layer spray gun 2, and the side wall of the spray gun 2 is communicated with a compressed gas source; a branch pipeline 6 extends from the spraying circulation pipeline of the spraying tower to the spray gun 2.

Circulating liquid is dispersed into small fog drops through a double-fluid spray gun, high-temperature tail gas is contacted with the fog drops, the fog drops are vaporized, evaporated and absorbed, the temperature of the tail gas is reduced, dust in the tail gas is removed roughly, a flue gas pipeline at the bottom of a quencher passes through an elbow 3, a flue and a spray tower are connected through the elbow at an inclination angle of 8 degrees, and air flows entering the spray tower can be uniformly distributed. Considering the corrosiveness of high-temperature flue gas, the quencher is made of carbon steel lined graphite.

It should be noted that: the included angle between the quencher and the spray tower is designed to be a downward-inclined inclination angle of 7-9 degrees relative to the horizontal plane, so that the flue gas moves downwards at first and then upwards, the redistribution distance of the flue gas from the quencher to the spray tower is indirectly increased, the flue gas is fully and uniformly distributed in the spray tower, meanwhile, the inclination angle is selected, the 7-9 degrees of design is obtained through engineering practice verification, the direct impact corrosion of the flue gas on the side wall of the spray tower is also reduced, and the flowing efficiency of the flue gas is considered at the same time.

Three layers of spray pipes 4 are arranged in the spray tower, a plurality of nozzles are arranged on each layer of spray pipe, the tail gas and the solution sprayed by the nozzles are in full contact reaction, and the purified tail gas is discharged into the atmosphere after fog drops carried in the tail gas are removed by a demister 5. Considering the corrosion of the circulating liquid and the hydrogen peroxide, the inner structure and the nozzle of the spray tower are made of carbon steel lining PTFE.

In this embodiment, referring to fig. 1, the branch line 6 is externally connected to a source of process water. When the circulating cooling water is insufficient, an external process water source can be started for supplement.

The flow of this embodiment is as follows: SO from mine reduction furnace tails₂Tail gas at 500 deg.C containing SO₂＜10000mg/Nm³The method comprises the steps of feeding the waste gas from the upper part of a quencher 1, arranging three layers of atomizing spray guns 2 on the quencher 1 from top to bottom, dispersing dilute sulfuric acid circulating liquid from a storage tank of a spray tower into small fog drops with the particle size of about 50 mu m through the spray guns, contacting high-temperature tail gas with the fog drops, vaporizing and evaporating the fog drops to absorb heat, reducing the temperature of the tail gas to about 150 ℃, and treating SO in the tail gas₂And (5) primary absorption. Because the inlet flow velocity distribution of the flue gas from the quencher to the spray tower is uneven, the middle speed of the section A-A is high, the eddy current motion is caused by uneven speed distribution, the long-time accumulation easily causes abrasion to the spray tower, the service life of the absorption tower is influenced, the contact of the flue gas and the spray liquid in the spray tower is insufficient, and the influence on SO₂The absorption efficiency. The flue gas pipeline at the bottom of the quencher 1 is connected with the spray tower at an 8-degree inclination angle, the flue gas firstly moves downwards and then moves upwards, so that the redistribution distance of the flue gas from the quencher 1 to the spray tower is indirectly increased, and the flue gas is fully and uniformly distributed in the spray tower. The flue gas pipeline at the outlet of the quencher 1 is provided with a thermometer, and the flow of the process water and the circulating liquid sprayed into the quencher 1 is adjusted according to the temperature. Tail gas enters a spray tower to be in reverse contact with circulating liquid, hydrogen peroxide in the circulating liquid and SO in the tail gas₂Reacting to generate sulfuric acid and water, and removing SO₂The purified gas is discharged into the atmosphere after passing through a demister at the top of the tower. This example is carried out with a high SO concentration₂The quenching-spraying integrated device for the tail gas of the mining reduction furnace purifies the tail gas and simultaneously recycles useful sulfuric acid solution.

The utility model has the advantages that the occupied area of the desulfurizing tower is only the spray tower, so that the occupied area of the desulfurizing tower can be effectively reduced; the waste liquid that produces in the quench cooler adopts the spray column, and cyclic utilization cools down, and accessible external technology water source supplements when the water source is not enough, has practiced thrift the energy and has reduced the production of waste water.

The above are preferred embodiments of the present invention, and those skilled in the art can make various changes or improvements on the above embodiments without departing from the general concept of the present invention, and these changes or improvements should fall within the scope of the present invention.

Claims

1. The utility model provides a mining industry reducing furnace tail gas rapid cooling-spray integration tower device which characterized in that:

comprises a quencher (1) and a spray tower;

the bottom of the quencher (1) is communicated with the side wall of the spray tower through an elbow (3);

the connecting part of the rear flue of the elbow (3) and the spray tower has a downward inclined inclination angle of 7-9 degrees relative to the horizontal plane;

the upper port of the quencher (1) is a flue gas inlet, the side wall of the quencher is communicated with at least one spray gun (2), and the side wall of the spray gun (2) is communicated with a compressed gas source;

a branch pipeline (6) extends from a spraying circulation pipeline of the spraying tower to the spray gun (2).

2. The mining reducing furnace tail gas quenching-spraying integrated tower device as claimed in claim 1, wherein: the branch pipeline (6) is externally connected with a process water source.

3. The mining reducing furnace tail gas quenching-spraying integrated tower device as claimed in claim 1, wherein: the quencher (1) is cylindrical and is provided with three layers of spray guns (2).

4. The mining reducing furnace tail gas quenching-spraying integrated tower device as claimed in claim 1, wherein: the quencher is made of carbon steel lined graphite.

5. The mining reducing furnace tail gas quenching-spraying integrated tower device as claimed in claim 1, wherein: three layers of spray pipes (4) are arranged in the spray tower, and a plurality of nozzles are arranged on each layer of spray pipe (4); a demister (5) is arranged above the spray pipe (4) at the top layer.

6. The mining reduction furnace tail gas quench-spray integrated tower apparatus of claim 5, characterized in that: the inner structure and the nozzle of the spray tower are made of carbon steel lining PTFE.

7. The mining reduction furnace tail gas quench-spray integrated tower apparatus of claim 2, characterized in that: the flue gas pipeline at the outlet of the quencher (1) is provided with a thermometer, and the flow of the process water and the circulating liquid sprayed into the quencher (1) is adjusted according to the temperature.